Задача 9

a = int(input())
b = int(input())
c = int(input())
d = int(input())

n1 = -1 * (a + b + c + d)
n2 = a * (b + c + d) + b * (c + d) + c * d
n3 = -1 * (a * b * c + a * b * d + a * c * d + b * c * d)
n4 = a * b * c * d

print("x^4 ", end="")

if n1 != 0:
    if n1 == 1:
        print("+ x^3 ", end="")
    elif n1 == -1:
        print("- x^3 ", end="")
    else:
        if n1 > 0:
            print("+ " + str(n1) + "x^3 ", end="")
        else:
            print("- " + str(abs(n1)) + "x^3 ", end="")

if n2 != 0:
    if n2 == 1:
        print("+ x^2 ", end="")
    elif n2 == -1:
        print("- x^2 ", end="")
    else:
        if n2 > 0:
            print("+ " + str(n2) + "x^2 ", end="")
        else:
            print("- " + str(abs(n2)) + "x^2 ", end="")

if n3 != 0:
    if n3 == 1:
        print("+ x ", end="")
    elif n3 == -1:
        print("- x ", end="")
    else:
        if n3 > 0:
            print("+ " + str(n3) + "x ", end="")
        else:
            print("- " + str(abs(n3)) + "x ", end="")

if n4 != 0:
    if n4 > 0:
        print("+ " + str(n4))
    else:
        print("- " + str(abs(n4)))